I have mach 3s now and was wanting to maybe go to a mach4 or 5 but will my turbo be able to support this much fuel?I wish i would have got the mach 4s after reading they burn cleaner than the 3s but should i go ahead and get the mach 5s?Would this have any side effects to the spool up of my turbo i do not want any more lag than i already have. What kind of performance increase could i expect?Would it be worth the $500. 00 cost to upgrade or is there a better bang for the buck?(nos or water meth )??????? Thanks Jason